d and f BLOCK ELEMENTS

Based on the text, which of the following best describes the stability of Fe2O3 compared to higher iron oxides?

• Higher iron oxides are more stable
• Fe2O3 is the highest known stable iron oxide mentioned
• Fe2O3 is unstable
• Fe2O3 is only stable at high temperatures

What is the significance of Mn3O4 being listed as a mixed oxide in Table 4.6?

• It is amphoteric
• It contains Mn in more than one oxidation state
• It is covalent
• It is radioactive

Which element's highest oxide is V2O5 according to Table 4.6?

• Vanadium
• Chromium
• Manganese
• Iron

What type of oxide is CrO3 according to the text?

• It is listed under the +3 oxidation state
• It is listed under the +4 oxidation state
• It is listed under the +5 oxidation state
• It is listed under the +6 oxidation state

Which of the following is NOT listed as a +3 oxide in Table 4.6?

• V2O3
• Cr2O3
• VO
• Fe2O3